Hello,
The tweaks are as follows:
First off, you need to checkout the svn source, as I previously indicated. From there, make sure you have the Emacs URL package installed, as I've also explained.
Do a 'make config', and then a 'make emacspeak'. 'make install' can then be run, and you should get a mostly working system. The tweaks come into place mostly for my own personal preference of using Espeak as a speech synthesizer.
There is a file in /usr/share/emacs/site-lisp/emacspeak/servers/linux-espeak/tclespeak.cpp. On line 612, change the type declaration from 'char' to 'const char', and run make. That will build the required library.
After this, go into /usr/share/emacs/site-lisp/emacspeak/servers/espeak, and since Gentoo normally provides Tcl and Tclx 8.4, change the first line to #!/usr/bin/tclsh, and add somewhere before the first set statement:
package require Tclx

>From this point, things should work with Espeak as a synthesizer. I suppose they aren't really required tweaks, but they're what I did when I installed the system manually.

I hope this is clear enough.
Thanks, and do let me know if not,
Zack.
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